Tone-purifier.



C. P. MARSHLL.

TONE PURFIER. APPLICATION FILED APR. 20, |915.

l, 1 89. 1 52. Patented J une 27, 1916.

m f2 @fw/ff PMM/m fl TTU/CNE V CHARLES P. MARSHALL, F WATERTOWN, YORK.

TONE-PURIFIER.

Specification of Letters Patent.

Patented June 2v, 191ea Application filed April 20, 1915. Serial No. 22,709.

To all 1lb/tom it may concern.'

lle it known that I, CHARLES P. MAR- suAm., a citizen of the United States, residing at Viatertown, in the county of Jefferson and State of New York, have invented certain new and useful Improvements in Tone-luriliers, ot' which the following is a specification.

This invention relates to tone purifiers, designed for use in connection with talking machines. generally, and the invention relates particularly to a device of the class for attachment to the rcproducers of victrolas, graphophones, phonographs and like talking machine, wherein the well known vibration-bars or members are employed for conducting the sound vibrations from the needle to the reprmlucing diaphragms.

The object oi the present invention is to provide vnovel and simple means for improving-rendering clear, pure and natu althe 'sounds ol voices, music, and the like, reproduced by talking machines', by eliminating practically all buzzing, yawling and recdiness, which are caused chiefly by an excess ol 'the high harmonic waves mingling with'the predominant notes (original sound waves) and their proper harmonics as incorporated in the records.

A iurthcr object is to provide a tone puriicr consisting oi an elastic or semi-elastic substance, which is preferably applied to the usual vibration-bar which conducts the sound vibrations irom the needle to the reproducing diaphragm. The nature and location ot the said purifier being such that .it absorbs or reduces the excess of the high harmonic waves or 4overtones produced by the vibration-bar, so that only the pure and clear and audible sound ot the predominant note as recorded is heard.

fr Vfurther object is to provide a tone purifier consisting ot a body of rubber or similar substance, but preferably a non-conductor of sounds, which is pivotally mounted on the' vibration-bar of the reproducer, and which is adjustable 'tor bringing the said body into contact withi the reproducing diaphragm ior bridging the said parts, thereby diminishing to a great extent the raw-rasping" noises caused by the fundamental note of the said diaphragm, which it has been found also contributes to the excess of the high harmonics.v And a further object is to provide means interposed between the record and the revolving disk which supports the record, for reducing the high harmonics of the fundamental-note of the said disk, which further contributes to the disagreeable foreign noise emitted during the reproduction of the record.

I attain these objects by the means set forth in the detailed description which follows, and as illustrated by the accompanying drawing, in which- Figure 1 isan elevation view of the reproducing part of a talking machine; showing my tone-purifier applied thereto. Fig. 2 is an enlarged side elevation of the transmitter showingy one member of my tone purifier pivotally applied to the vibrationbar; the said member also engaging thediaphragm. 'Fig 3-is a similar view; showing the said member disengaged from the diaphragm. Fig. 4 is a front face view of the transmitter. Fig. 5 is a central vertical section, taken on line 5 5 of Fig. 1; showing the second member o r part of the tone puriier interposed between the record and the revolving disk. Fig. 6 is a view; showing a modification of the purifier member-applied to the vibration-bar.

In the drawing, 2 represents the cabinet of the talking machine, and 3 the revolving disk which supports the record 4. 5 reprel sents the usual tapering tone-arm, upon the free end of which is mounted the transmitter 6, and 7 represents the reproducing diaphragm of the transmitter.' All, of the foregoing parts may be constructed in the usual manner and of any suitable material.

8 represents one form of the usual vibration-bar which is mounted upon the collar or rim 9 of the transmitter. One end 10 of the vibration-bar is bent at right angles to the body and connects-in the usual manner to the center of the diaphragm, 7 the bend of the said bar will be designated, the elbow, 11. The opposite end of the vibration-bar 8 has a socket 12 into which the reproducing needle 13 is inserted, and the latter is held in place by a set-screw 14.

Fig. 1 shows the needle 13 in engagement with the record, in the act of reproducing sounds recorded thereon. As the record is rotated,`the needle 13 follows the record groove and is vibrated in the usual manner.-

The vibrations of the needle are communicated to the bar 8, and the bar in turn vibrates the diaphragm 7 and the latter converts the vibrations it receives from the .needle 13 and the -bar 8 into audible sounds.,

lil

'Mr time purifier in lwo parl". :La and li. 'lille parl roumain. in tbe prelerred forni. oi a eonsieenrr `oi" the rounnun Valier rubber eraser, vfliirh is more or lese: pliable. Sponfgy and adhesive. The ywid bod); may la of any suiiablr size or shape. but preferably made in the l'orn: ii-:lun in the dra wing. l`ilepart A is preferably mounted upon tlie.\ili1'a tion-bar f5. and Yfor (his purpose the underside oi' said pari has a'kerf 11', wliirli receives the elbow llV oi' the :Quid liar. and the laid parl ia preferably piroled to the liar S by means of a pin 15. wlii yh allows the said part. to he tilted toward and anar ifi-oni the diaplnaffm. u beet seen by comparing! Figs. 2 and Il. The pivot l5' is: employed rhiefly to prevent the neeidental detaelnuent ol the member A.. The kerl il of (he part A preferably narrower than the. bar S, so that a little' pressure is required ior forcing the said part into position, and the rubber being relatively soft yields readihY lo the preseure, and being;- naturali)v adhesive clings elosely enough to the bar to remain in either of the adjusted positions. By thus disposing the rubber part A, each predominant note tln'ouuboat a reproduction, is reliexed el przu'iicalijy all harshnesa or rawnesa due to the excess of die high harmonics produeed hy the intera! riinatiors` olf the har 8. linithe. said part, notwithstanding-its felty and giumny nature, still allows the said bar-io vibrate under the inlluenre of the needle 153 to the right extent for aiding the. diaphragm 'l' in the reproduction ol the true musical lone or noie originally rerorded.' The elbow il or" the har as explained, produces longer wave lengths than the other portiona4 of the said bar, and 'these longer lateral "ares yield more ann stronger har molino-bolli upper and lower inrlnonirs.

' Byk disposition of the filler A substaxn tialii' ai.: Shown in Fig. $3. it is to reduire to a greater eiileni the long laieral fibrations or' ille bar S. This dii'ainiahes the Cess of the. iwertone of the i'mzdanien'al noie olf-the said bar, and reduces to a marked de1 grue the harah and grating sounds oi' the reiiiroduelion.

To :still further reduce or niriiy the high harmonies and tl'ierefore to clear up the predominant noea of the reerad during the reprodiieiion, the puri/lier pmt A ,may be tiflted on the pivot 15 fee Fig. 2)'50 as to hring its forward orlree. end into en gement with the outer fare or the diaphizggxn' 7, preiQ-n aldi' :some iii'iie distance beyond the een i oi the diaphragm. When the. rubber part A iri than brought into Conta-St with 'the diaphr jen 7'., he er. of 'the l'ligb harinmiies et' ilie diaphragm i5 insiantly eliminaeiil,

bleek of soll rulzber. baring the' n the diaphragm will then arliculati'. i`

mdaniental note natural@v and (listini-tlv.

. it snbdues the orertonei: of" both the vibration-bar S and the diaphragm This, anda to iuf'reime (be naruiony and snioothn as ol.v

owingy lo ils structure and its intimate assoriation with the reiord disk, as well as the adjacent sonnil-'roinluotingr and amplifying parts oi' the talking.; machine, also ribrates in unison with the other parte ot' the instrunient, and :weordingly the said disk has a fundamental note of its own, which is usuallyaerosnpanied by an excess ol the high harn'ionirs, the saine as the vihratio11- bar and the diaphragm. ln order to complete the purifying process, the said part B ol the liaruumir purilier is provided. The part l consists of one or more thin and pliable sheetsl or disks of rubber or similar material, which are mounted loosely upon the top sin-'face of the revolving disk El, and upon which rests the record, as i. The disks B, are preferably slightly larger in diameter than the record, and being soft allord a light c-uahion for the record, and as the, rnbber disks are. relatively smooth and adbe* sive, the underside of the record closely engages and clings to the adjacent rubber disk, The rubber sheets B are non-conductorsi of sumida, and therefore they insulate the records from the revolving disks, to the end that, the excess of the high harmonics or overtone which accompanies the Afundamental note of the revoking disk, is reduced or modified to such extent that the harsh, buzzing.; noise, contributed by the revolving disk, and which in the past mingled with the sound waves of the predominant note of the record, is thereby eliminated. The rubber sheets B also serile to reduce the excess of the high harmonies of the rec0rd-disk, well as the revolving part which supports the said record.

Fig. 6 illustrates a :acidification of the member which is applied to the vibratorbar, which coneists oa Hexible strip of ruhber A', of about the saine consistency of the member A, each end of the member A is slotted, as best seen fit-1G. To apply the part A', it is first lient in the forni of a horseshoe, .and the opposite ends are then placed in engagement with the, top of the liar B, with the slots 1G directly over the said har, after which the member is l'orvod dmrnwardly until the bar enters the raid slots. The rublver strip fr is preferably Still' and springry enough so that its ends ex pand until they respectively hear or press i.' disposing ille purifier as; shown in Fig..

Vsition as shown.

against the portions and 12 of the bar. The said member will then remain in the po- The members A may be made to different lengths as shown by the full and dotted lines in Fig. 6.

The two parts A and B of mv-harmonic purifier' may be varied in size, shape and consistency, and they may be applied to the reproducing parts in any suitable manner.

But in order to produce the best results, they'V must both be employed at the same time. If either ofv said parts is omitted during the reproductiono'f' a record, the rendering of the record will be more or less faulty and unnatural, as described.

itis obvious that some changes or modi' fications may be made in the parts of the device, within the scope defined bv the appended claims, without departing from the spirit of the invention.

Havinf" thus described my invention, what claim as new and desire to secure by Letters Patents, isl 1. The combination of a talking machine, having a. sound reproducing mechanism inL cluding a vibration-bar and a diaphragm, and a tone purifier, said purifier. comprising an adhesive elastic part mounted upon the said vibration bar and movable into and out of engagement with the diaphragm for reducing the lateral vibrations of the said bar, substantially as described.4

2. The combination of a talking machine having a vibration-bar and a reproducing diaphragm, ,and a tone purifier comprising an elastic part mounted upon the said bar and capable of' a. movement into and out of engagement with the diaphragm for subduing the high harmonics of the said bar, substantially as described.

3. The combination with a talking machine having a vibration bar and a reproducing diaphragm, of-a tone purifier adapted for attachment' to the vibration bar, the said tone purifier having a kerf therein to reccinefthe vibration bar and movableinto nidl o'tg'f en lageiueht with the diaphragm.

et.' ,ne' combination with a sound reproducer,`includin'g a diaphragm and vibration bar, which actuates said diaphragm, a tone purifier mounted 0n said vibration bar, the said tone purifier being capable of a movement whereby the same is brought into engagement with the diaphragm for subduing the excess of the high harmonies of the diaphragm and thelbar.

`5. The combination with a sound producer including a diaphragm and a vibration bar, of an elastic purifier Amounted on said bar, said purifier having a kerf therein to receive a portion of the'ba'r and adapted to adhere and cling to said .bar for reducing the lateral vibrations thereof, thesaid purifier being capable of' a movement into and out of engagement with the diaphragm.

6. A tone purifier for talking' machines comprising a resilient body pivotally mounted upon the vibration bar which vibrates the reproducing diaphragm, the saidbody being rcapable of a movement into and out of engagement with the diaphragm, forl the purposes set forth. 7. A sound purifier for talking machines, comprising a non-conductor of sound mounted upon the vibration bar-which actuates the diaphragm, the said non-conductor of sound overlying the side of the diaphragm and arranged Within the borders thereofl whereby -it may be brought into and out ofengagemeht with the diaphragm.

8. A tone purifier' for talking machines, comprising a body carried by the vibration bar that vibrates the reproducing .diaphragm, the said 'body being capable of a movement into and out of operative association with the diaphragm, substantially as described.

9. A tone purifier fortalking machines comprising a non-conductor of sound operatively associated with the vibration bar that vibrates the reproducing diaphragm, the saidv non-conductor being capable of a movement into and outof' operative relation with the diaphragm, substantially'as described.

10. A tone purifier for talking machines comprising a purifying member pivotallyl supported by the vibration bar Which vibrates the reproducing diaphragm, the said body being capable of a movement whereby it may be brought into or out of enga-gement with the diaphragm, substantially as described.

11. A tone purifier for talking machines, comprising a body movably supported by the vibration bar which vibrates the reproducing diaphragm, the said vbody being adapted to be moved -into or out of engage ment withvthe diaphragm, substantially as described. l

In testimony whereof I affix my signature 

